Thanks for all the suggestions! Looks like pink and white are the main options (of course yellow would be good too but much harder to get).
Another thing worth mentioning is that I really only want 25c for the frac as we usually play 25c/25c when we have a cash game. 50c would be a bit too much for my game (I'm mostly hosting STTs) so PCAs are out - definitely wouldn't want to murder those!
I think I'd like to avoid x18 edge spots since the 1s and 25s already have them. Also the 8V ES are nice but would dominate the 1s. I think the Jerry's Nugget 1s would also have the same impact.
So far the NYNY $1 is the best potential candidate and it seems to fit the flow of the set pretty well. The only downside is the blue edgespot leading to a lot of blue in the set (but not that bad a thing since it's my favourite colour).
I did some digging and have the following chips in my cupboard but I don't think they really work 100%