Indoor Tulips - Fill glass container about with glass marbles or decorative rocks. Set tulip bulb on top of marbles or stones; pointed end up, add more marbles or rocks; so bulb is surrounded but not covered. Pour fresh water into the container.
DIY Borax crystal Snowflakes - this site suggests you could spray with a spray enamel to keep it from dehydrating and turning back to powder. needs to be kept out of the reach of small children (who might put in mouth).