12 binder page theme ideas (with examples)
A theme is what turns nine random cards into a page. These are themes that keep working for me, and some real pages I've built with them.
Themes built on a place
1. Night
Dark skies, city lights, moons and shadows. Ghost, Dark and Psychic types fit naturally, but the best night pages mix in a few you wouldn't expect, like a Water type swimming under the moon. Keep the borders in mind. Dark artwork with silver borders looks sharp, while a gold-bordered card can stick out.

2. Reef
Underwater scenes: coral, kelp, sunlight coming down through the water. Recent illustration rares have a lot of these. Mix bright shallow-water cards with a few deeper blue ones so the page has some depth.
3. Vibrant forest
Greens with sunlight and flowers. Bug and Grass types are the obvious fill, but a Fire or Electric type caught mid-jump in a green scene keeps the page from feeling flat.

4. Sunny city
Warm streets, markets, beaches and blue skies. These pages work because the cards share light, not because they share a type.
5. Setting sun
Orange into red into purple. This is the theme where a gradient order matters most. Put the brightest orange in one corner and the deepest red in the other.
6. Snow and ice
White and pale blue. These pages look clean, but they can get washed out. Add one or two cards with strong dark lines to keep it crisp.
Themes built on the art
7. One artist
Many illustrators have a style you'd spot from across a room. A page of nine cards by one artist looks like a gallery wall. Open a card in Binder Lab and use "Similar cards → Artist" to find the rest of their work.
8. Pattern pages
Stripes, swirls, stained glass, sketch lines. Binder Lab tags pattern and art style for each card, so you can search for one directly.
9. Rainbow
One card per color, ordered around the color wheel. It's easiest with nine pockets: red, orange, yellow, lime, green, teal, blue, purple, pink.
Themes built on a story
10. An evolution line
Classic for a reason. Try mixing different art styles of the same line so it doesn't look like a set list.
11. One Pokémon, many versions
Nine different cards of your favorite, sorted by color. Eeveelutions are the most popular version of this, and they work nicely as a rainbow.
12. Day to night
Use two facing pages: morning to afternoon on the left, dusk to midnight on the right. It's the best use of Spread view I know.