One thing that helps me when I start getting writers block is that I free write. Just take a piece of paper and start writing random words. Doesn't have to make sense but...with some luck, one word will come across and start a whole rp.

There is a trick that I have where I write the first paragraph and/or the last paragraph, that way I have a start and an end point. I have to figure out how to connect the two paragraphs according to the character or characters involved. It gives me something to do while daydreaming/bored as shit in lecture. It doesn't have to make any sort of sense just some sort of Controlled Chaos that seems like fun.