I know how you feel Alicia, I get that all the time, usually cos I can't draw any pose other than a forwards one, and can't even get that right most the time.

A couple of good "how to draw manga" type sites, which you may or may not know of already are:

http://www.bakaneko.com

http://www.polykarbon.com


Other than that I would say that I sometimes look at other people's art when I want inspiration, not to copy but just to get ideas of poses they have done. Sites like http://www.side7.com and http://www.deviantart.com are good for browsing other people's art.

Also sometimes if I want to draw a character in a different pose but am not sure what, or if I'm not sure how to draw that pose, I will look at a photo of someone, like a celebrity/pop star in an interesting pose and try and draw a character like that.

I get so many uninspired phases though I'm in one right now, I drew a picture of Kuja but just can't get the motivation to colour it... Ah well hope this helps you a little