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By using following method you can easily able to theme your template in whichever colour you want..

Step 1: Go to your Blogger Dashboard.
Step 2: Go to Template > Edit Html
Step 3: look for the widget you want to be themed (use Jump To Widget)
Step 4: you can see the id='example'  in this example is the widget name i want to give the background colour with border.
Step 5: Now yo know the id of your widget, here it is example., now go to Template > Customise > Advanced > Add CSS.
Step 6: Add the below code.

.ecample {
border: 3px solid #ffffff;
background:#00000;
}

if not work replace .example with  #example because in some cases we have to edit Class='example' instade of id='example'

Step 7: Experiment with Border and backgroud colours and click on apply to blog..
All Done..

Experiment with Extra Code

.example {
border: 2px solid #000000; -moz-border-radius:1px; -webkit-border-radius:15px;
background:#ffffff;
}

 In above code border corner can able to change...
using This code you can able to edit which ever widget you want to edit but try is needed for better result..