The Adobe Creative Suite has to be one of the more popular design packages. Illustrator is specifically a great tool for any project including website layouts, vector art, illustrations, logos, and so much more. One resource many designers utilize are patterns for backgrounds.
Repeating patterns are often more popular in websites to fill the whole screen at any resolution. Similarly patterns can be placed into posters and other print artwork. And this collection includes over 450 various design patterns you are free to download. Some bulk packs include multiple patterns which you can download all at once.
If you’re looking for more information about creating your own patterns, see Bittbox’s post The Power (and Ease) of Patterns in Illustrator.
For more Illustrator resources at DesignM.ag see: