Yellow with large black numbers gives this a modern look. Add the age or leave it blank – Back says Come Party but can be changed to say what you like. Complete with RSVP information.

Source: Yellow Birthday Invitation | Zazzle

Beautiful invitation with a horse. A copper gradient background adds a glow. Marquee with the words happy birthday can be changed. Add the names, date, and details. A beautiful invitation that can be easily customized for many special occasions and happy milestone celebrations — the text can be used for any event including anniversary party, birthday party, wedding, save the date, exclusive affair or event.

Source: Equine Birthday Party Invitation | Zazzle