Marble & basalt slabs?

[Evil Hamster]

Is there a way to make them?

Or fake it with one of the various odd shapes showing up in NEI?

 

[Lambert2191]

basalt block with a saw above it

 

[Evil Hamster]

I see, a little more versatile than regular slabs!

 

[Evil Hamster]

Thanks

 

[OmegaPython]

You should be able to do that with any vanilla or redpower block that is not transparent and does not have tile entity data (I think that's how it works)