For the Jefferson:Airplane -Style (the poster is not a font, the individual characters were done by hand) i recommend making rectangles with rounded corners (

- round corners by tugging at the circle in the corner of the new rectangle) then make some slender rectangles , put little circles at the end, Path->Union, make a few copies (should look like matches), distort them randomly. Use these "matches" to make the desired characters out of the rounded rectangles (Lay them on top, select both, Path->Difference). Align the rounded rectangles. Path->combine your text. Make your text the lowest object. Make a freehand curve that goes like you want your Text to curve. Select text and curve. Effects->Generate from path->Pattern along Path.
Distort some more.
This is rather quick, and because of the handmade characters the result looks as trippy as the original
