Is there a website where I can upload my photos and add a rainbow to it?

I want to upload my picture and put a design rainbow(representing the gay flag) and have it blended to the picture(ex:like if you want the feature black & white, halloween feature,bronze feature,etc) if you know what I mean. I tried picknic but it doesn’t design it like I want it to be and I don’t feel like painting it either.Is there any websites that has the rainbow feature?