Since we don't know what your sketch looks like or what visual elements would best enhance it, I think it's difficult to just give ideas.  But there is certainly plenty of material and examples out there where you can identify things that you would like to add to your sketch to enhance its visual appeal.  Take a look at the Exhibition thread to get ideas... most post code when presenting their project.  Take a look at www.openprocessing.org.  They have many sketches, along with code.  Pull ideas and look at the code to see how they did it.  If you get stuck on a particular idea, post in the appropriate section for community help.  That's the best advice I can offer.

As an engineer, the biggest challenge in looking at sketches has been the visual language.  I simply lack words to describe the techniques and decisions the artists used.  Most artists wouldn't notice the difference between a FPGA and microprocessor chip on a circuit board and would skip over the key ingredient that made the board cheap/fast/easy-to-use.  In that way, engineers skip over useful visual things that are right in front us.