Here are a few which i think they are fun to develop.

1) Expenses Manager App. Few screens a database some nice reports bum done!
2) Text File indexer and it's interface to look for terms inside those files and return the matches. The algorithm to index the text files is fun and you can play a lot with the search algorithm. Only two screens but you have to think carefully the algorithms.

Ye I wish I could do any of that, no possibility to install extra soft in this computer so I just went with bat took me longer i'm Not proud of me but its works hahaha

@GrizzlyMagnum

Is a joke about the typed language.

In C# you have to declare what type your variable is. For example

int aNumber; this mean you can only save integer numbers in aNumber, if you try to save text in aNumber it will give you an error.

On the hand in js you just go
var aNumber; and then save in a number whatever you want. A String, a number, a function anything.