Yes—homemade color filters can work for creative effects, but they’re not ideal for accurate color correction. If you need predictable, repeatable results (for example, matching ambient light), proper photographic gels are the better choice.

For special effects, people do use improvised materials such as colored plastic, candy wrappers, paper, tape, or thin fabric. These can add color, but the results are less consistent and they may reduce light output.

Heat is the main safety issue. Plastics can melt if placed too close to a hot light source. A simple way to reduce risk is to mount the material with an air gap rather than taping it directly to the flash or lamp. A small cardboard collar or holder with a slot for the filter can help keep it separated from the light.

If you just want an inexpensive starting point, an entry-level gel sample pack is often more practical than trying to build a full set from office-supply materials.