A bit of a turn up, I've just acquired Splurge from the Slime Boglins in pink which I believe is the first time a Slime other than Splash has been found in this colour. Unfortunately he's damaged with the snot trail between his finger and nose snapped off, but given that he is, for the moment at least, a 1/1 discovery and that I managed to get him for a good price I'm very happy with him. I've only been able to snag some low light pictures so far as the flash was completely washing out the colours, I'll update with some daylight snaps at the weekend, but here he is with his blue and yellow brethren and a couple of other pink figures for comparison.
I've always figured it was unlikely that just the previously known sculpts in the rarity colours were produced and turning up this guy gives me hope that the other five 'undiscovered' Slimes are still out there hiding in an attic somewhere.