If you want to have an artistic project but don't want to invest in paint and expensive papers or canvas, try ink as your medium. All you need is a small unlined book—one made for using ink that you can find at a local art supply store—and a pen. The pen you see in the foreground of the above photo is one I use a lot. It's a Uniball Vision Micro. The ink is permanent, which means that once it has dried I can paint over it with watercolours and it won't smear.
If you want a perfectly rendered ink drawing you can start with a pencil drawing and go over it with ink, then erase the pencil afterward. However, you can also sketch with ink as I have done below. One of the benefits of sketching with ink is that it helps you get over perfectionism. Ink is unforgiving of mistakes but mistakes often make for the most interesting art.
The page above is from one of my sketch books. The subject are simply objects that I found around the house. (And my husband. I find him around the house frequently.)
If you want to explore using ink for drawing or calligraphy there are so many directions you can go with it. Beautifully coloured inks and fancy pens with multiple nibs, even glass, are available for exploration. Go and have fun with ink.