The lowly Button, the smallest of items. The Poor Mans Mini Block. Both functional and decorational, it offers one of the most finest, intricate details in builds. I think the biggest improvement would be concrete and terracotta buttons, as the full spectrum of colors would allow them to fit into any build. Of course seeing them in all of the stone types would be amazing, and make perfect sense. I would even go so far as to add even more material types, like magma blocks, diamond/gold/copper, slime/honey, etc. Complimentary details for almost every kind of block (with some possible exceptions) allow us to make the kind of creative detailing and customization we've been using for 12 years, just with an expanded palette. Currently we can make rocks and details on wood/stone. With these we can pretend they're pebbles, rocks, blobs, gems, chips, debris, fungi, moss, leaves, slag, chunks, embers, gold bullion, cabochons, pearls, bolts, shells, beads, crabs, anemones, barnacles, bugs, the list is endless. With this I would also like to suggest changing the recipe to two or four Buttons per block.