Late 90's/Early 00's Marbles, Signed

[Rollaround]

I've tried researching these marbles without success so far. I bought them in the 1990's/2000's era. They are well made with the outer latticino matched with the striped solid core and with aventurine stripes accenting the core. Both have the same signature, looks like an M or maybe Mc ending with a letter that has a tail like g or y. Any thoughts are much appreciated.

[The Nickel Guy]

Looks like Irving to me on the second half.  These are cool, look like tornados.

[Fire1981]

Try to get a few more pics of the signature. It’s their first initial and last name. We’ll see if someone can ID them for you🔥

RAR

[Ric]

I have been trying to learn more about art glass marbles and I'm pretty sure I have seen this type before but I am having a hard time placing them even after seeing the signature. In situations like this, I always hope that @Alan will chime in - he's probably forgotten more about contemporary art glass marbles than I've ever know.

[Rollaround]

More photos- the marbles are 1-1/8" and 1-1/4". Thank you for any thoughts.

[Alan]

I have looked at the signature pics in different ways/different assumptions and have nothing in my mind or list.  The style doesn't point to any particular style and could have been made by most any tank artist.