@Firr 2500 of them?? Heck, you could make a TIS-100 mesh computer and not even scratch the surface. At that scale, drivers for eink badges that you could resell? distributed mesh lighting controls? Very impractical business cards?

Perhaps up your alley, but it's not going to use enough of them, maybe animatronics?

There's also the whole space of IOT-style widgets, but needing physical wires or additional HW for interconnecting things would be a drag. In the end you might need to embrace having a lifetime supply of 8bits or a double lifetime supply of 4bit nibbles.