For old RK items I would like to see less pristine icons. Scratches will be hard to see in the small version, but maybe dull colours, dirt, spots, more rickety contraptions and quick fixes...
For example, since the GCB is an actual circuit board, why not one of those cobbled together with some old belt? This may be more difficult to put together as a 3D object, but I for one would be happy with a hand painted icon if it fits the bill better.
I hope that will be what they look like when they become visible on a character, too.