If you want something that gives the ideas of being outdoors while still visually interesting. Try this vector and image pack.
To see a sample before you buy, check out the project here
.ai, .svg, .png, .jpg files included
Each iteration is slightly different than the last, but all together give a full set.
Images are at 3000x3000, 1536x1024, 800x600.
Full files are for Adobe Ilustrator
Give each of these a try with your next design