孔版印刷四色图标

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.

复制后，可参考下方“建议替换”项目改成你的主题；带【方括号】的内容请优先替换。