Have you tried prompting with the word "risograph"? It makes a cool effect.
Prompt: Create a collection of icons representing [a theme], they belong together as a single theme. Put them in a 2x2 grid (no lines). The background is pure white. Make the icons as risograph prints. No text. No color distortion. Vibrant and not faded. Stochastic stippling and sand-like noise pattern within color fills. Each icon has a thick black outline.
The theme in this image was "cute but weird animals (that are real)".
Prompt: Create a collection of icons representing [a theme], they belong together as a single theme. Put them in a 3x3 grid. The background is white. Make the icons in a colorful and tactile 3D style. No text.
- dogs with different emotions
- bananas
- January
- the same cat in different emotions