|Cute rainbow cake topper. And a bucketload of rainbow sprinkles.|
This is an easy type of "banner" to make. Simply cut colorful paper straws into smaller sections. String your straw "beads" onto a length of embroidery floss or twine. The heart is made from some sparkly glitter paper with a little "tag" that is folded over to string it on. The side supports are more straws slipped over wooden skewers for extra support. I couldn't find any tape so I tied the thread to the side supports. Tape (or cool washi tape) would be much easier.
You could make the cake white or blue for a rainbow-themed party! There are so many types and patterns of paper straws available. I got mine from Target! There are a ton of options of these websites: