As per recent trend, colourful vector graphics are the top favourite choice for most web designers. You can use the vectors as SVG instead of using JPG or PNG images as they are most of the time costs lots of file sizes.
Below I have listed 10 premium Creative Vector Graphics Product Links from CreativeMarket.com
Main benefits of purchasing vector graphics is that you will be able to easily change any color of there vector using any Vector Editing Softwares such as Adobe Illustrator. You can also mix and match elements from multiple vector file to a new one by just copy paste.
But in case you do not know how to use the vector editing softwares you can always contact me and I will easily customize your vector files. You can contact me from here http://www.themepurpose.com/contact/. I always give discounts in my services if you are a regular reader of this blog.