Welcome to the forum.
I confess I'm not too sure that I understand what you want to do. Do you want to find more cross stitch charts or possibly create your own from scratch?
If you want to find more charts, there is a heck of a range. For fairly standard charts try http://www.cross-stitch-heaven.co.uk/cross-stitch-charts-9-c.asp
. There are many other companies that do similar stuff.
For moderately ambitious charts of modern images there is Heaven & Earth Designs: http://heavenandearthdesigns.com/
For some very ambitious charts based on out of copyright images: http://www.scarletquince.com/index.php
If you, like me, can't find exactly what you want because it's a little different or not quite what anyone else wants, then consider creating your own charts. There is software out there (PCStitch, PatternMaker and my own freebie BlendThreads available through my signature) which means you can convert almost any digital image into a chart, or use the editors within the software to create a design from scratch.
Hope this helps you to focus a little closer on exactly what you want. When I came to this forum I knew I was sure there was 'more to cross stitch' than I was doing, I just had no idea what that could be. The kind people here have helped a lot, and my pictures have been utterly transformed.