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Here's an example that does what you ask... https://hackaday.com/2011/11/05/controlling-shift-registers-via-spi/
Is it safe ...
Depends on a few things. Do you expect all LEDs to be on at same time or more of a sparse display? You need to limit power disipation of the 595, which depends on the package type. Newer SM LEDs usually don't require as much current, which also varies by color, that can help lower power.
CanyonCasa
@Owen
Is it safe to use the 595 to run 8 LEDs at once? I think I remember reading somewhere you shouldn't do that as the current it too high for the IC but I could be wrong?
I'm a complete noob at electrictronics and still learning.
PS.where is a good place to learn/find out about ICs?