Here are two birthday cards I have designed recently for my sisters' birthdays.
You may notice they both use Helvetica bold.
The first is my favourite of the two, based on a poster designed to promote Helvetica back in the 60's, it stacks the lettering and blocks in the V shaped counters of the Y in red creating an instant interest point. I am planning to screen print this card and have it for sale on Etsy soon.
The second is a lowercase dot to dot B which is a fun and unusual idea for a card, it can be completed or left alone. (This was the inspiration for my A B C pillows).