create postcards

In the past before i switched to MAC I would create my postcards for my biz on MS Word of all things save as a pdf and upload to my online printer who would print and mail for me. I can open my word docs in pages but pages doesn't support back ground colors?? at least thats what its telling me. Any one have any good program suggestions i should try out?

trying to create standard size postcards one sided colors and with images and text.

Thanks,

Decoman...