I have a toy language too but it is not at this step yet. Personally I would just create my own simple programs and try out some common algorithms to see how it

I have a toy language too but it is not at this step yet. Personally I would just create my own simple programs and try out some common algorithms to see how it works. I do have some old BASIC books (PDF) that I have tried to convert to my language. The books are full of simple games. Beyond that I would consider each language feature and write a program using that. You could also look in some data structures and algorithms books/sites for examples.