Ah 6mm, God know I have parts of a travel set figs in 6mm. Each figure is mounted on a 6mm face-to-face earth magnet. The ground sheets are 1/4 of an inch graph paper. I have several 2x2 magnetically attractive sheet. Character figs are the problem.
So I get the attraction.
As for 15mm, this year's project was to do all of the counter sets from the GDW one to the FASA that came with their deckplans. The based being the color of the counter. So I could say I had a Traveller set.
Evyn