Get T-Zer0 from ClickBOOM, it requires a CD-ROM drive though.
Also get ADOOM and all the DOOM clones, like Gloom, Breathless, Fears, Genetic Species. I hope you have a 50mhz 030, but a 33mhz will suffice.
Also try Playing F/A 18 Interceptor on an 030...it will fly!....in some cases it crashes.