The first condom I ever saw was blue.
I was in third form, surrounded by 20 other kids, and we were being taught by our P.E. teacher how to put a condom on an inoffensive, phallic-shaped plastic educational tool.
I don't think I've ever seen a coloured of flavoured condom out of its packet ever since. Novelty condoms have never really made sense to me: why you'd want your penis to resemble a Christmas tree is confounding.
Arguably, there are noble safe sex reasons for employing novelty condoms. Some STIs can be transmitted through unprotected oral sex. Chlamydia, Gonorrhea, Syphilis, Herpes/HPV are all possibilities (but there's almost zero risk of contracting HIV in this way, FYI). A strawberry or banana flavoured condom theoretically makes safe oral sex more appealing - maybe there's supposed to be something appealing about bubblegum flavours.
When you look online, the marketing spiel for coloured condoms seems to be all about "impressing your partner". "Need to add a little colour to your sex life?" asks one condom manufacturer. "Ready to impress your partner by exceeding their sexual expectations with flying colours?" claims another.