There are some really great oil paintings available on Etsy.. and it's a great place to start an art collection (the prices are really great!)
This first artist is my favorite Etsy artist right now.. and she does a lot of custom pieces. Her paintings are so peaceful, I hope to own one of her pieces someday.
This artist paints whimsical pieces and also beautiful landscapes. I'm not normally a cow person, but I love this white cow.
This next artist has a broad mix of work. Some of her pieces are a bit too much for my taste, but if you go through her Etsy shop there are some more simple, beautiful pieces.