I know that there are the standard 1 1/8" threadless headset top caps out there, and that some people put designs on them, and some people have put watches or compasses or other gadgets on them. I know that there apparently are knurled caps, but haven't seen an example. I've seen the headset cap/screw combos that allow the brake housing to pass through the fork on the way to the front brake (usually front disc). What other types of top caps are out there? Does anyone have a collection of example photos?