You can find some Match-3 assets here (public domain):

http://opengameart.org/content/puzzle-pack-2-795-assets

Hello i am a 2D and 3D artist and i have been doing games for 4 years now. i saw your post that you are in need of an artist. i am interested on applying for the position. i will give you my artworks for my previous games.

https://www.behance.net/juliastorybored

i did all the artworks here. the 3D, 2D and even the UI.

The past games i did was "Whiz Kitty", "Toys Inc" and one is "Land of Heroes". These are ready and downloadble on the appstore and playstore already except for the last one. 

 if you are interested please do shoot me a message here. Thanks!

Ok here are my games. i did all the art here the 2D's 3D's and the UI.

here is Whiz kitty's art and download page:
https://www.behance.net/gallery/27186951/Whiz-Kitty
http://piplay.com/index.php/games/whiz-kitty/

Here is Toys Inc's art and download page:
https://www.behance.net/gallery/32799185/Toys-Inc
http://piplay.com/index.php/games/toys-inc/

Here's Totem art and download page:
https://www.behance.net/gallery/33038931/The-Guy
https://www.behance.net/gallery/28585941/Totem
http://piplay.com/index.php/games/totem-igmc-2015/ 

For LOH (Land of heroes) art Link:
https://www.behance.net/gallery/24840513/Land-of-Heroes
https://www.behance.net/gallery/24412603/Astralis

Before Doing the Art, Can you tell me the details and deadline of the art you need? A list would be very helpful to me and i want to know how much your budget is for the background art, and sprites? 

Thanks again.