I am not a photoshop guy.
What are you trying to make a pattern of.
If it is a portrait from a picture then Gimp is the free way to go.
If it is letters and line then Inscape works. I often take a picture, clip art or silhouette and have that converted to a vector or use vectors from some free sites.
If you give us some more ideas on the pattern you desire, some of the talented people maybe able to help.
don