Oooh, Sugru!
I bought a new pair of boots the other day because my previous pair, which have done sterling service, have a big split on the sole of the right foot which means they’re no longer waterproof. It was going to cost £55 to replace the soles because of the way the boots were manufactured (rather well, but as an integrated unit), so I went and got a £45 pair of waterproof hiking boots instead.
I might make plant pots out of the old boots, but not before I see if I can fix the problem with some Sugru.