Blue sleeve use for conservatory wall 36W fluorescent fixture

For my Halloween sesh I was debating whether I should use the OSRAM Mellow 40W pink tube (1952-53) the Thorn Radar Red 40W (1980s) or a blue sleeve - I decided the blue sleeve method

Planning to get some coloured fluorescent tubes in T12 and T8 form which are for decorative use. Come next month ill invest in T8 and if any T12 coloured tubes from eBay