Elastic Balls, The Screen Saver
Elastic balls move around your screen, bouncing off each other. You can control their number and speed or let your computer make these decisions for you. Theoretically and practically, you can watch this screen saver for many hours, days, even years straight without seeing the same scene twice. ... It's not the typical screen saver that you get tired of after a couple of minutes. ... Send us your feed back. ... We hope you will give this screen saver a try and that you will find it very attractive and relaxing.
ftp://ftp.abcomputing.ca/ElasticBalls_Setup.exe - 3Mb - Download - Screenshot

E-Motion Deluxe
E-Motion Deluxe is a action/puzzle game for 1 or 2 players for Windows, requires Direct X. It's a remake of E-motion by The Assembly Line (1990). The object is to bounce same colour balls together. To make things harder there are blockades and elastics. ... Features the 50 original levels, 50 new levels, raytraced graphics, original sound and music, mouse joystick or keyboard control.
http://members.home.nl/bdr/emotiondeluxe/emotiondx.zip - 830Kb - Download - Screenshot