I have been trying to breed a blue rose for well over a year. I play daily. I do all the things suggested in tips and tricks noted on ACC and elsewhere online. I am determined. No luck.
My young daughter plays, sometimes. Every now and again I play her town to pull weeds, etc. She showed a little interest in breeding, so I gave her purple & orange roses, and explained the requisite 10,000 times that 10 year olds require to hear something before they 'get it', how to breed special reds to maybe get a blue. Every time I noticed a potential special red, I put it in a special spot, and told her.
I focus on other goals (finally got that sea globe!). I go into daughter's town so her character can get friendly with villagers so they will celebrate her birthday, this month. This sparks her interest, so she starts playing again.
After a couple months of not trying, she gets a blue rose.
I am NEVER going to live this down!
I paid her a million bells, and had to make Slurpee promises to get that thing from her!
I think I may have too many other hybrids in my town. *grumble*
So now I have a blue rose. On to the purple pansy!
Time travel, don't time travel - it's your game, play AC however you want!