30 push-ups,
50 squats,
20 pike-ups,
7 pull-ups.

Do all of those in a row, right from one to the next 2-3 times. Is that considered HIIT or something else?

Also, I feel like my exercises are getting bland and basic.
I normally do squats, push-ups, twist sit-ups (recently changed to pike ups instead), and pull-ups.

What are some alternatives for those same or similar muscle groups?
-Preferrably bodyweight, but if you know some good weighted ones, whether heavy or light
-Preferrably ones that would train my proprioception and such as well.

Thanks a bunch guys.

the above is true

for variety in your workout try modifying what you are doing already.

push ups= incline push ups, handstand push ups, planche, handstand holding, handstand walking

squats= pistols, box jumps, box step ups ( do 10 on each side for 10 rounds and tell me your bored... ), broad jumps, vertical leap, lunges

pull ups= weighted dead hang pull ups, pull up negatives, top outs ( 2 for 10 rounds with those box step ups and tell me your bored...  ), muscle ups

pike ups= sit ups, L sits, wall sit, knee to elbows (10 for 10 rounds with everything else and tell me your bored...  )

and don't forget about the burpee!!!! 

workout for time:
10 rounds of
2 top outs
10... ok 5 box step ups each side
10 knee to elbows

post time... boom, a workout for you. have fun... sucker 

HIIT = generally with running although can be with something like swimming.

Tabatas are a 'type' of HIIT where the intervals are time and the effort is max.

Metabolic conditioning/circuit training workouts use a variety of exercises like yours. So basically you fall under this category.

And if you want some just head over to APK WOD or CF WOD or any of the affiliates who do their own WODs. Those are generally very effective because they have some background on how to maximize output as opposed to if you make up your own it might not be proportioned well. But whatever works.. if you're good at it then keep doing it.