Groupings of things are an interesting idea for a sketch journal.
Think of all groups you could possibly come up with from shells, or leaves, or flowers, or buttons, or favorite pens or even old abandoned sofas (someone I know has a collection of photos of those!!!). In my case due to the holiday I chose favorite ornaments on my tree. My sketch group is using holiday sketches for a challenge and I thought this might work!
Every ornament has a story attached to it. I'll bet you have those kinds too!! Lots of nostalgia drawing these. Remembering the countries I visited, the people who made them for me, or emotional stories associated with them. I like that now, no matter what might happen to them in the future, I have a record of them.
This is an 8 x 12 journal by Moleskin. Mostly my Lamy Safari fountain pen and watercolors.