There are tons of Steam Skins since this feature has online for years. Many designers created lots of awesome masterpieces. If you were tired for default skin, you could try using some custom Steam Skins.
Steam布景有非常多，自從功能上線以來已經很多年，有很多作者做了很多好看的布景，看膩原生布景的使用者可以考慮使用自製布景。

Steam Skin can be highly customized. Such as layout, position, size, font style, border, background, etc. You can customize almost everything with Steam Skin. Thus, a good Steam Skin will give you a whole new Steam experience.
布景可以修改的範圍非常廣，包含所有介面的排版、位置、大小、字體、邊框、背景等等，幾乎全部都能改，所以一個好的布景可以讓使用者有玩全煥然一新的感覺。

For me, I recommand Metro for Steam
至於推薦，我個人選用 Metro for Steam 這個布景

• Official website 官方網站 - http://metroforsteam.com/
  
• Official Steam Group 官方群組 - http://steamproxy.net/groups/metroforsteam

Skin is a complete feature in Steam. You can easily install a Steam Skin with few steps:
布景在Steam已經上線好幾年，整個系統非常完善，安裝布景很簡單只要幾個步驟即可:

1. First, you have to choose a custom skin and download the files. The file format depends on the author and upload platform. Generally, a Steam Skin should be a folder.
   首先要先選一個布景，然後下載該布景檔案，布景檔案每個人發佈的方式不同，依照作者習慣與上傳平台而異，一般而言布景檔案會是一整個資料夾
   
2. Copy the skin folder to
   將布景資料夾複製到
   
   Steam installation folder\skins Steam 安裝資料夾\skins
   default path for 64-bit WIndows is
   64bit作業系統預設位置是
   
   C:\Program Files (x86)\Steam\skins
   
3. Go to Steam Settings > Interface > Select the skin you wish Steam to use, and choose the skin you just downloaded
   到Steam的設定 > 介面 > 選擇您希望Steam使用的面板，選擇剛剛下載的布景
   
4. Restart Steam and it's done.
   重新啟動Steam，就完成了

By editing the Steam Skin file, you can tweak how the skin looks like. For easy illustration, I'll use Metro for Steam 3.8.6 as example:
藉由手動調整Steam布景檔案的內容，就可以將布景微調成自己喜歡的模式，為了以下說明方便，會以Metro for Steam 3.8.6版來做說明:

1. First, locate the Steam Skin files
   首先找到字體檔案，一般是放置在
   
   Steam folder\skins\Skin name\resource\styles Steam資料夾\skins\布景名稱\resource\styles
   For example
   例如本篇範例路徑是
   
   C:\Program Files (x86)\Steam\skins\Metro for Steam 3.8.6\resource\styles
2. Locate the style file "steam.styles and open it with text editor, such as notepad (Notepad++ recommanded)
   找到字體檔案「steam.styles」並使用文字編輯軟體開啟，例如記事本(個人推薦Notepad++)
   
3. This file contains lots of skin settings. By editing this file you can highly customize the Steam Skin. Here I'm going to explain some entries about Steam Chat. You can easily find these entries by searching.
   這檔案包含各種項目設定，可以將布景手動修改成各種自己喜歡的樣子，這邊簡單敘述跟聊天室字體有關的項目，可以用搜尋直接找要改的比較快
   
   console_text_error

   Connection lost, reconnect message

   斷線、離開、加入聊天室訊息

   friends_chat_text

   Other's chat text

   其他人的聊天內容

   friends_chat_text_self

   Your chat text

   你自己的聊天內容

   friends_chat_history

   History chat text

   舊的聊天內容紀錄

   friends_chat_event

   Friend Status Changes

   狀態改變訊息

   friends_chat_bright_event

   Your Status Changes/Connection/Game (Someone is now playing something. Click here to join.)

   某人正在玩什麼遊戲，按此加入

   friends_chat_url

   Chat URLs

   超連結文字

   friends_chat_name_ingame

   ID while in-game

   遊戲中的ID

   friends_chat_self

   Time stamp

   時間戳記

   friends_chat_name

   ID while online

   上線的ID

   friends_chat_accountid

   Normal ID

   一般的ID

   friends_chat_securitylink

   Never tell your password to anyone.

   千萬不要將密碼告訴任何人
   These are some common entries only not all of them. You could find more in the file and edit if needed.
   以上只列出常用的幾個，其他更多如果有需要可以自己修改探索
   
4. Find the entry you want to edit and here's some argument descriptions.
   找到想改的項目之後再來是參數說明
   
   textcolor

   Text color

   字體顏色

   font-size

   Text size

   字體大小

   font-family

   Text font name. If not set the default will be used.

   字體名稱，直接打字型名稱可以修改，若沒有會改用預設

   font-style=uppercase

   All words capitalized

   全字母大寫

   selectedtextcolor

   Text selection text color

   滑鼠圈選時的文字顏色

   selectedbgcolor

   Text selection background color

   滑鼠圈選時的背景顏色
   And here are some color you can use.
   這些是一些可用的顏色參數
   
   White45

   Grey

   灰色

   White

   White

   白色

   White75

   Bright white

   亮白色

   Friends.OnlineColor

   Skin default Online color

   布景預設的上線顏色

   Friends.InGameColor

   Skin default In-Game color

   布景預設的遊戲中顏色

   Friends.IgnoredColor

   Skin default Blocked color

   布景預設的黑名單顏色

   Focus

   Skin default selection color

   布景預設的圈選顏色
   or you can use custom color with "r g b a", e.g. "201 201 141 255"
   或是可以用 "r g b a" 自訂，例如 "201 201 141 255"
   
5. Save the file and restart Steam and it now should work.
   修改好之後存檔，然後重開Steam即可生效

If you have no time to modified it yourself, you may wanna take a look at my work. I slightly changed the text format in Steam Chat and left others untouched. With my modify, I increase the chat text size, decrease the timestamp size and system message, and make self chat golden. Looks great under 1920x1080 desktop resolution!
如果懶得自行修改的話，可以使用我自己目前使用的檔案，主要是加大聊天字體、縮小時間、縮小進出聊天室與系統訊息、本人講話金色高亮，使用1920x1080解析度看起來很舒服！

And here's the modded file link
這是修改檔案的下載連結

To use this mod, you have to install Metro for Steam 3.8.6 first, and overwrite the file in this folder
使用方式為安裝好Metro for Steam 3.8.6之後，將下載的檔案覆蓋在下列資料夾中即可