There are many sites that offer custom pbt dye-sub printed keycaps (about $4). The most difficult thing is often to find something that will really look nice once printed. So the question is if you think that it could be interesting to have a monthly thread, with a theme defined by the administrators, where each user could post an idea or a picture for a custom keycap. GH or directly the user, could then choose the most popular idea and have it printed and delivered to each user by the chosen manufacturer.