Here a few of the magazines with upcoming deadlines. To read more about the specific challenges and descriptions of the individual publications click here. Take a look and maybe you'll feel inspired!
Greencraft, Art Doll Quarterly's metal challenge, and Somerset Home.
Somerset Holiday's and Celebrations, Somerset Digital Studio, Belle Armoire Jewelry and Somerset Studios' Halloween Challenge.
Cloth Paper Scissors will be publishing a special "gifts" magazine before the holidays. The deadline for this is April 2nd. Otherwise it looks like they accept art and articles on an ongoing basis.
If you're interested I posted some ideas and tips for submitting to an art magazine here.