I heard adding corks when boiling octopus and squid supposedly makes the flesh more tender. Another tactic was to pound the hell out of them. The jury's still out on the corks. The pounding worked somewhat but the leggy creatures were often not much to look at afterward.
I do neither now that I've got a sous vide cooker. I can now specify my calamari's exact tenderness.
As for what I do with corks now, I split them lengthwise and stick them flat side down on a thin sheet of plywood with white carpenter's glue. Voila, corkboards of various sizes.
I framed a few and gave them away as gifts but lately I just use a different pattern to form the border and nobody objects.
The trick is to split the corks evenly. I tried to glue them as whole corks but a few kept coming off after a period of use.
I clamp the cork and use a high-quality, sharp kitchen knife to chop the cork in half. The key here is to swipe the knife a couple times on a sharpening steel before cutting. Make a scoring mark as a guide on the top of cork and then cut through in one strong downward, sawing movement. Caution: Be careful to cut cork and not fingers.
Still, I get many off-centre cuts. I level the crooked cuts with a belt sander and save the thinner ones for a separate project where, if need be, I can match the depth. I should probably create a wood form by drilling a hole the size of a cork and a cut for the knife to slip through
Easiest and most useful? I nail a split cork every foot or so to the edge of workshop shelves to serve as a mini pinboard for messages to myself, recipes, wine instructions, or shelf labels.