Who said that to create great images you need to spend great money? Well the answer is no. There are many high quality pieces of software out there on the inter web designed for graphic manipulation and design. I will mention here the ones I currently use, and will let you know a few things about them.
GIMP
GIMP stands for the “GNU Image Manipulation Program”. It's an Open Source program for graphic designers very similar to Adobe Photoshop. It is very powerful, yet simple to use and very intuitive. The program works on different Operating Systems as well as many languages.
What I like the most about it is the way the windows are independent from each other. Everything is independent allowing for the windows to be customized to your liking, and be positioned where you want and need them without disturbing the imaging process
Their site, gimp.org, contains a lot of information about the software, including the latest updates, and recent news. Oh yeah, they also offer tutorials and download links.
Inkscape
Inkscape is a vector graphics editor similar to Adobe Illustrator and Xara Extreme. It utilizes the scalable vector graphics (svg) format, allowing it to create images that can be stretched, moved, and modified without losing resolution or clarity. This piece of software, although in its infancy, has proven to be very powerful, and fairly easy to use.
I use it to create clip art and other items I use on more than one design. For example, if I draw a heart for a logo, but then want to stretch it out to twice its size for something else, then I can do so without sacrificing quality.
Their website, inkscape.org, contains downloads and documentation, along with tutorials and recent news.
Tux Paint
A rather simple program designed for kids to learn the basics of their creativity. With sound effects and sticker/stamp tools, it makes for a fun time for the kids. I am fairly new to this piece of software, but the kids surely get a kick out of it.
Their site, tuxpaint.org, contains screen shots, explanations and of course the good old download.
Have a blast
I know I do. Enjoy your graphics software, especially since it's free. Play with your photos, turn a good picture into a rather embarrassing one for someone. The sky is the limit.