Ohh Deer is a website that uses several UK artists who contribute their designs, which are then printed onto various products and sold to retailers in the UK. Each artist gets a (small) percentage from every item sold with their design on. Have a look here
Their way of finding new stuff is by competition... You can submit up to three designs for 'throw pillows' or cushions.
Have a go - it's free - you never know!!
Having said that - there are LOADS on there...best to use the filters.
Here are my three:
I used the Photography, Digital and Nature filters