A number of months ago we got rid of a couple of old, dead, red towels and replaced them with a pale green set of towels. For me a 'set' is 2 bath towels (since there are two of us), 1 hand towel (I hate visiting someone and being confronted with only their currently-in-use bath towels on the rail when I wash my hands - do I wipe my hands on my shorts or do I use a corner of their towel when I don't know who's it is or what part of their body it has been used to dry?) and a bath mat.
My favourite colour is blue but, as we already have towels in pale blue and medium blue, DH said we had to get something different so we ended up with the green that we could agree on (it's called 'Frost'). I don't (much) mind what the colour is but in future I'd like to have matching sets that go into the bathroom together. I'm thinking that if / when we next move, I'll ask for some new towel sets, to replace the old ones, as a house-warming gift. :-)
As for brand, we have had a lot of rain here lately and our towels have been hanging on the backs of chairs to dry. I noticed today, when I went to put some of them away, that some towels were dry while others weren't. Interestingly, it's the new, fluffier ones that are dry while old, thin ones are still damp. So, as well as asking for new towels, I'll specify that brand (cotton ones, made in India, that we got from Sheridan of Australia) for preference.