Hi! A lot of people use free jump stirrups which are very customizable. You can pick a color and even put a flag on them.
Jin Stirrups are awesome, I've been using them for 5 years now. I bought mine in the local tack store but you can order them online
I got mine in my local tack store
You can get Jin stirrups they come in all kinds of colours. http://www.jinstirrup.it/