Best iPad Photo Apps: PicShop 2.2 Lite
There are lots of basic editing tools here, with adjustments made by dragging sliders on the app. Edit parameters such as Hue/Saturation and Brightness.
There’s also several filters, including Lomo inspired ones to use – you can even mix and match filters together for added impact.
Upgrade to the paid (full) version to get extra frames and filters if you like what you see in the Lite version.