Pillowsandthrows.com has a great assortment of funky and bright poly mats. Indoors for the mudroom or laundry? Outdoors for the picnic area or porch?
Overstock has quite a few also:
Home Decorators Online also has some great new ones..
Martha Stewart Living Fretwork Rug ( 3 colors )
Abbot Area Rug ( 2 colors )
Ballard Designs...Grandin Road