How to replace white box with app icon?

So here's what I did: I SSH'd into my ipod touch using WinSCP. I went to my applications folder and copied the folder to my desktop. I then plugged my ipad in and transferred the app to my applications folder via SSH again. I changed the parameters so the app would work. I opened the app on my ipad and it did work perfectly. Only one problem... The app's icon is just a white box. How to I fix this? Are application icons not stored in the app folder?