Sign utilizing flexible led tube secured by unique elements and method of creation/use

A modular lighted sign assembly configured to mimic the look of a classic neon sign and operable to display a message, comprising:

• a modular background structure comprising at least two distinct background units that are joinable to form a single contiguous background structure, each background unit having a front-facing surface, a rear-facing surface, and at least one elongated recess having a width dimension and a height dimension formed in the front-facing surface in the shape of a pattern, the pattern comprising a portion of the message to be displayed by the sign;
• at least one flexible light tube having a width dimension complimentary to the width dimension of the elongated recess such that at least a portion of the flexible light tube is sized and configured to nest within the elongated recess, the flexible light tube being maneuverable so as to conform to the shape of the pattern, the flexible light tube being operable to illuminate the message displayed by the sign;
• and
• a frame assembly including a first component configured to secure the background structure to the frame assembly and a second component configured to secure the frame assembly to a display structure;
• wherein upon joining the at least two distinct background units to form a single continuous background structure, the at least one recess of each distinct unit aligns with one another to form the complete message to be displayed by the sign.