純藍的背景看了很久，自己看不下去。就從舊的圖庫裡面隨手抓了一張，再切出符合這個版型大小的圖片。之後，在設定樣版，可以直接設定背景圖，就可以看到成果了。
謎之聲：你一句話到底做了多少事情…
因為程式碼看起來其實很噁心...所以我用文字帶過就好 XD
把header-wraper 這個div裡面換成下面的東西，之後就可以直接從後台從標頭的右下直接按下編輯來設定背景圖片！
<div id='header-wrapper'>
<b:section class='header' id='header' maxwidgets='1' showaddelement='no'>
<b:widget id='Header1' locked='true' title='Superbil.info (標頭)' type='Header'>
<b:includable id='title'>
<b:if cond='data:blog.url == data:blog.homepageUrl'>
<data:title/>
<b:else/>
<a expr:href='data:blog.homepageUrl'><data:title/></a>
</b:if>
</b:includable>
<b:includable id='description'>
<div class='descriptionwrapper'>
<p class='description'><span><data:description/></span></p>
</div>
</b:includable>
<b:includable id='main'>
<b:if cond='data:useImage'>
<b:if cond='data:imagePlacement == "REPLACE"'>
<!--Show just the image, no text-->
<div id='header-inner'>
<a expr:href='data:blog.homepageUrl' style='display: block'>
<img expr:alt='data:title' expr:height='data:height' expr:id='data:widget.instanceId + "_headerimg"' expr:src='data:sourceUrl' expr:width='data:width' style='display: block'/>
</a>
</div>
<b:else/>
<!--
Show image as background to text. You can't really calculate the width
reliably in JS because margins are not taken into account by any of
clientWidth, offsetWidth or scrollWidth, so we don't force a minimum
width if the user is using shrink to fit.
This results in a margin-width's worth of pixels being cropped. If the
user is not using shrink to fit then we expand the header.
-->
<div expr:style='"background-image: url(\"" + data:sourceUrl + "\"); " + "background-position: " + data:backgroundPositionStyleStr + "; " + data:widthStyleStr + "min-height: " + data:height + "px;" + "_height: " + data:height + "px;" + "background-repeat: no-repeat; "' id='header-inner'>
<div class='titlewrapper' style='background: transparent'>
<h1 class='title' style='background: transparent; border-width: 0px'>
<b:include name='title'/>
</h1>
</div>
<b:include name='description'/>
</div>
</b:if>
<b:else/>
<!--No header image -->
<div id='header-inner'>
<div class='titlewrapper'>
<h1 class='title'>
<b:include name='title'/>
</h1>
</div>
<b:include name='description'/>
</div>
</b:if>
</b:includable>
</b:widget>
</b:section>
</div>
謎之聲：看的懂有鬼！
再來就是幫右邊加上了搜尋的功能，是draft版才有的，哈
