[plt-scheme] Custom GUI's in Scheme

Hey everyone,

I am having some trouble figuring out what the best way would be 
to create a textually intensive custom GUI toolkit or something of 
that nature for a program. Basically, I have someone who wants a 
program with a very...unique look. She (hehe, go figure) wants to 
have a program with lot's of color, shadows, etc. 

The problem is that I can't find a way to do that with the MrEd 
tookbox, and I assume you can't. What's I'm looking for then, is a 
good way to create this application. I know that with other IDE's you 
can create your own objects, such as buttons that are bitmaps, etc. 
But I am at a loss of how to do it in PLT scheme. Really, if I could 
just find some way to put color and a little more definition into the 
basic tool box, that would be great, rather than having to rewrite the 
entire thing. :-/

Now doubt my ignorance is rather glaring out at you all right now, 
but I couldn't see the way to do this.

- Aaron Hsu