Okay, I initially said we weren’t going to do any WordPress themes but after consideration and looking at some of the sites submitted I decided to show how a few simple changes to a Wordpress preinstalled template can personalize a site.
Which uses the twentyeleven theme. As submitted it looked like

By uploading a custom image for the header it already looks different:

But that sure takes up a lot of space so scrolling down from where uploaded the image to where it says Header Text and uncheck the option to display it:
Results in:

Finally, by adding the following CSS to a custom stylesheet:
.custom-background {
background: rgb(249,249,251);
/* Old browsers */
background: linear-gradient(45deg,rgba(249,249,251,1) 0%,rgba(215,214,219,1)
19%,rgba(249,249,251,1) 49%,rgba(215,214,219,1) 87%,rgba(249,249,251,1) 100%);
}
#page {
box-shadow: 10px 10px 5px #A7A7A9;
}
We get a nice drop shadow effect on the page with a diagonal gradient background, all done with CSS :

Not including the time to create or edit the image used you have a custom look in less than 10 minutes.