Or you could try olde n ugly weddings (type that into Google and the website does come up) - as the name suggests they are primarily a wedding stationery company but also do birthday invites etc with caricatures on! We used them for our wedding and just had to send photos of us and a description of the location we wanted to be in, what we wanted to wear etc and they produced absolutely fantastic invites which looked just like us - and all our guests loved them. May be worth a look if you want something fun?