Suggestions

great idea, pexels.com is a fantastic resource

however you could make WP Pexel more useful with a few tweaks

I think they use imgix (just guessing) and it would simply be a matter of changing the src subdomain and appending the URL with various attributes (long term you might be able to add cropping etc)

https://static.pexels.com/photos/2242/wall-sport-green-bike.jpg
is 14.2MB

https://images.pexels.com/photos/2242/wall-sport-green-bike.jpg?w=1260&h=750&auto=compress&cs=tinysrgb
is 147kb

I’d also suggest using the resizing tool with a ‘keep aspect’ option

Google Page Speed Insights is giving a ‘0’ score… so this is definitely worth looking into

saving unnecessary bandwidth makes us all good internet citizens

Thanks