Some time ago I made a template in MS Publisher you can alter for a general warning sticker.
This is what it looks like and you make it as large or small as you like within reason:
Let me know if you want the publisher file. You can edit the text in the text box to match your laser wavelengths & powers.
There's also this JPEG file. I think this is someone else's they posted on here for free use but can't remember who.
Should be able to resize it in photoshop.
I'm sure you can buy some sticky foil to go through inkjet printers. However its cheaper to buy from Rob unless you need a custom size / message.
For ILDA 10 X standard, there was also this sign:
(I think this version was mine, but again a long time ago).
Another General sign I made again available as publisher file making it editable:
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