Depends on your budget and where you going to display. There are some nice art galleries in KL. I personally like Wei Ling Gallery if you have the budget.
Segaris Gallery has beautiful selections of contemporary art. If you are looking for something a bit more refined but still not that expensive, there is one gallery in Uptown Damansara. Artfordable Gallery, you may find something there. The owner is painter hence better QC i feel. www.artfordable.com.my however paintings can be very personal and you may need to survey around KL.

Wait wait if you are on a super super tight budget, there is a oil painting stall in Plaza Damas and Ikea, you can find something for less than RM200. If you want prints, you can download the image from shutterstock and print lah!