Hello Thunkers,
I was searching for cool backgrounds and I found a free beautiful Background package and thought to share with you all.
Here is the link- http://d.pr/f/hgVU
P.S - Resize the image before using it in thunkable. As image size is too large so the app crashes.
Here is a view of such image I used in my app.
Hope you all will love it… 
