A lambda/4 transmission line transforms a short into an open and vice versa!
Also if you have a real impedance, lambda/4 line always transforms into another real impedance. A lambda/8 line can transform a real impedance into a complex impedance which maybe useful sometimes.
By the way, I have math proof for λ/4 transmission line , I am not sure about the derivation proof for the inductor and capacitor using λ/8 transmission line