I have purchased a few blue flower seeds during the last two years, and some of the flowers have actually been blue!
Some, however, are not even close.
I've seen bluish violet daisies in the mountains. I have not been able to collect seeds yet, but I'll try again this year. In the meantime, I found some seeds.
I knew the flowers wouldn't be as blue as they are on the package, and I assumed they'd probably be closer to violet. But this?!?
If I didn't know better, I'd suspect someone dumped Clorox on my flowers! Fortunately, I love them anyway, and hey, I can turn them blue!
Who wouldn't be drawn by the lure of blue roses??? But there ain't no such thing without blue food coloring. Period. No rainbow roses, either, and no black roses. Um, roses typically aren't grown from seeds but from cuttings...
What about blue strawberries??? Yes, they are pretty to look at, but who'd want to eat them? They look as though they've been radiated! (In a sense, they have been, via photo manipulation...)
Here is how to make a blue strawberry outside of a photo-editing program. Here's a cute patriotic method.