There is.
Basically, on the mobo there's a little patch of connections, which are for the power LED, reset switch, HDD LED, system speaker and power switch.
If you work out which 2 pins are for the switch, then you can make your own power switch and LED's and just hook them up to the motherboard.
The other option is to buy a cheap ($5) case and just rip all the power/LED/etc cables out of it and use them in your own case.
Pic
2 of those pins are for the power on switch. Then there's all the other switches as well.
The motherboard manual will have the pin configuration.