having phm fibre craft thoughts because aside from the iconic fox cowichan sweater (which is hand knit and based on a specific pattern; mary maxim are of course now selling a kit for the Movie Version of the sweater which is pretty cool, though a more accurate set of charts can be found for free on ravelry) and the fact that they've released both an official embroidery pattern and an official 3d printing pattern (both available for free on the official website)
there is the little crochet earth hacky sack (for which someone has created a free pattern) and The Quilt (which someone here managed to hunt down!)
it makes sense that the quilt was sent along with the mission in general and not any specific person due to the breadth of luck symbols and the general global/save the earth vibe of the thing
but! the hacky sack earth and the sweater are also both handmade. both are the result of yarn-based fibre arts. the hacky sack must be handmade by virtue of crochet not currently being reproducible (at least not easily) by machine. as for the sweater, even if we hadn't been told that someone hand knit (rather than machine knit) it, there is also some visible rowing out (this is not meant to be an insult! rowing out happens, especially when, for example, you're hand-knitting a sweater for a production with a tight deadline. i've done theatre costuming, i know that done doesn't mean perfect and at the end of the day the sweater is gorgeous anyway)
all this is to say that this film and its production clearly values fibre crafts and handmade things. and i personally think it's likely that grace knits and/or crochets. it's possible that the sweater and the hacky sack were gifts, but the film establishes that grace has no friends nor family.
the sweater fits him as an adult so it can't be very old (i.e. from childhood) despite being a vintage-style sweater (unless it was inheritedβmy dad had a sweater very similar to this, but we're canadian and grace is not so i don't know if that's probableβor thrifted), the pattern has been altered/customized while still being based on a specific hand knitting pattern (which indicates that significant thought and effort was put into itβmore so than there already is for hand knits), and stem folks certainly like knitting (especially designing their own patterns relevant to their fieldsβa knit klein bottle has been in the top 20 of ravelry's hot right now for the past few days, for example).
the hacky sack could also have been purchased at some point (i'm not sure if, for example, it's feasible that a student could have gifted it since i'm not sure how schools and teacher/student interactions work in the states), but in my experience store-bought hacky sacks usually have basic patterns (stripes, and usually due to variegated yarns) since they're cranked out by hand in sweat shops (again, the lack of machine-based production rears its head). intarsia crochet colourwork is kind of a pain in the ass, especially (to me, at least) in the context of a ball where you're also managing increases and decreases and realistic-enough-looking continents. meaning an even decently recognizable-as-earth sphere would be at least mildly effortful; for that reason it seems unlikely to be anything but handmade on a personal rather than commercial scale.
furthermore, the significance of gifting the hacky sack to rocky "so you can remember me" makes more sense (to me) if grace made it himself. the hacky sack being store-bought does not subtract from the meaningful nature of the gesture; conversely, the hacky sack (particularly because it looks like earth) being made by grace himself (the only human rocky has ever met) imbues further sentimentality. the earthling who is saving earth (which sent him to die) gifting a likeness of his home planet to the eridian who saved him (and who is saving him again) is purely symbolic. that likeness being a personally handmade hacky sack adds something. if you show someone a painting you like, you're showing them part of yourself; if you show someone a painting you made, you're showing them part of yourself and then some.
anyway ryland grace is a fibre artist pass it on