You mean “Featured Posts” below the slider?
Go to Appearance / Theme Options / Featured Posts. Enable featured posts, select featured category (cat from which you want posts to be displayed) and number of posts to show.
If you want specific posts from multiple categories, you can create some “featured” category, and then add those posts to that category, and select that cat in featured category.
For photos, try these:
Stock Free Images
Free Photos Bank
Free Media Goo
Free Digital Photos