If you have PowerPoint, you can create web buttons.
I know, because I HAVE Adobe Photoshop...and I don't always use it.
Research shows that redesigning your call-to-action buttons can improve clickthrough rates by 1,300% (or more).
You just need Microsoft PowerPoint, and this document will provide the templates to create buttons for:
Grab your free download, and start getting your website to convert visitors into leads!