blue plant or tree ideas

Hi, I am new to this forum and I hope someone can help it is a bit of a strange one but I am quite the novice when it comes to plants. My cat has recently died and I have had him cremated, I loved my cat had him for a very long time and he's a real miss. Normally we would bury him in the garden but I don't have one so I am thinking put his ashes in a large pot that I have with something really nice. Now here's the strange bit, my cat loved baby blue whenever there was a blanket etc... that was baby blue he would purr and cuddle it for days no other colour but baby blue. So I am wondering if anybody knows of anything that will thrive in a large pot something we can move with that's not hard to look after. I was thinking a tree of some sort with blue blossom. Any ideas greatly appreciated.

Thanks.