For my roommates Birthday, I made this easy felt banner.
Basically, I cut some triangles out of felt and sewed them on to some thick bias tape.
Then I cut the letters out of felt and just stuck them on to the flag.
I didn't sew those on because I figured I can re-use this banner for all sorts of occasions. Just cut out more letters to say things like "Happy New Year", "Celebrate"... anything really!
I think it added a lot of fun to her day!