You could color the clip art with Photoshop. That should save some time (print&scan), and you could really go to town with effects (shading&lighting).
Small example, although it's not clip art (coloring with Photoshop becomes pretty essential for anything consisting of more than line drawings), and only the thumbnails:

Anyone wanting a quick instruction on how to color in Photoshop can
email me.
(BTW, that example above was my first coloring attemp.)
On a general note:
Personally, I'll only use clip arts as "fillers" (if there's 1/8 page or less of blank space). I ain't got a good URL though. And, frankly, I can't find the LPJ Design image portfolio
